Failure Investigation of a High-Temperature Cast Soot Blower Lance Tube Nozzle

M. C. Fatah*, D. T. Putra, B. A. Kurniawan

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)


Failure in the form of stress corrosion cracking has occurred on the SS304 lance tube soot blower. The hardness test showed high value for the area close to the failed region. The SEM test showed formation of heterogonous and porosity film on the surface. XRD indicated that the oxides determined were Fe2O3 and Fe3O4. Metallographic of the lance tube revealed pitting as the stress concentrator. Pitting is caused by chloride (as chlorine) and SO2− from the flue gas. SO2− reacts with water to form acidic sodium bisulfate (NaHSO4). Stress is generated from exposure of lance tube parts to high and low temperature during its service.

Original languageEnglish
Pages (from-to)1124-1129
Number of pages6
JournalJournal of Failure Analysis and Prevention
Issue number4
Publication statusPublished - 1 Aug 2020


  • Hardness
  • Pitting
  • Sodium bisulfate
  • Stress corrosion cracking


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